Liquid level control valve



FIG. 1 is a left side elevational view of a liquid level control valve showing my new design, the right side being a mirror image of the left side shown;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front elevational view thereof; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a liquid level control valve, substantially as shown and described. 